car suction mount

4.5inch car suction mount 1/4-20 threaded insert
Durable suction mount with threaded insert for attaching equipment.

• Provides a reliable, temporary vacuum mount, without drilling holes.
• Rubber vacuum pad will not mark or damage most surfaces.
• Attaches to flat , smooth, nonporous surfaces.
• Red-line indicator warns user of any vacuum loss.
• Check valve allows repumping without loss of remaining vacuum.
• Lift tabs on vacuum pad edges permit instant release.
• Supplied with vacuum pad protector.

Vacuum cups employ the force of atmospheric pressure to grip a surface: When a vacuum exists between the cup and the surface on which it is attached, the weight of Earth's atmosphere holds the cup in place with incredible force.

The vacuum cup's pump features a plunger with a red line, which serves as a vacuum indicator.

A few strokes of the plunger evacuate the vacuum pad, causing it to seal securely to the attaching surface. When the cup is attached completely, the plunger stops moving and the red line is hidden within the pump. A visible red line indicates that air has leaked back into the pad, making vacuum insufficient to use the cup. However, if the red line becomes visible while the cup is in use, a check valve allows the user to repump the cup without losing the remaining vacuum.